Steam-boiler superheater.



No. 765,307. PATENTBD'JULY 19, 1904 FLJ. COLE.

STEAM. BOILER SUPERHEATER.

I APPLIGATIONIILED APR. 21. 1904.

N0 MODEL. I 3 SHEETS-SHEET 1.

PATENTED JULY 19, 1904.

PfJ. 00m; STEAM BOILER SUPERHEATER.

APPLICATION FILED APR. 21. 1904.

3 SHEETS-SHEET 2.

- E0 MODEL.

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PATENTED JULY 19, 1904.

I F. J. com-3. STEAM BOILER SUPERHEATER.

' APPLICATION FILED APR. 21 1904.

3 SHEETS-SHEET 3.-

HO MODEL.

' UNITED STATES Patented July 19, 1904.

PATENT OFFICE.

FRANCIS COLE, OF SCHENECTADY, NEW YORK, ASSIGNOR TO AMERICAN LOCOMOTIVECOMPANY, OF NEW' YORK, N. Y., A CORPORATION OF NEW YORK.

STEAM-BOILER SUPERHEATER.

SPECIFICATION forming part of Letters Patent No. 765,307, dated July 19,1904.

Application filed April 21,1904. Serial No. 204,161. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS J. COLE, of Schenectady, in the county ofSchenectady and State of New York, have invented a certain 5 new anduseful Improvement in Steam-Boiler Superheaters, of which improvementthe following is a specification.

The object of my invention is to provide a superheating appliance forlocomotive or other I tubular steam-boilers which shall be of simple andcomparatively inexpensive construction and ready applicability inconnection with boilers of the ordinary standard constructions and inwhich a large area of superheating-surface may be presentedwithoutreducing to any substantial degree the area of water-heatingsurface which might otherwise be obtainable in the boiler or injuriouslyobstructingthe draft through the tubes and without necessitating anydifference of form or increase of dimensions of the smokeb0x.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure 1 is 5 a vertical longitudinalcentral section through the smoke-box and a portion of the waist of alocomotive-boiler,illustrating an application of my invention; Fig. 2, avertical transverse section through the smoke-box, taken in the 3 planeof the axis of the stack and exhaust-nozzle; Fig. 3, a similar sectiontaken in a plane in rear of the stack and with the 'T-head, headers, andsteam-pipes removed to show the relation of the smaller and largerboiler-tubes more clearly; Fig. 4, a vertical longitudinal centralsection, on an enlarged scale, through the T-head, one of the headers,and the connected superheater-pipes; Fig. 5, a front view, partly insection, of slightly more than one- 4 half of the T-head with four ofthe headers detached and indicated in dotted lines; Fig. 6, alongitudinal section, on a further enlarged scale, through portions ofan inner and an outer superheater-pipe and of an inclosing superheatingfire-tube; Fig. 7 a transverse section through the same; and Fig. 8, alongitudinal section taken at right angles to Fig. 6through the rearportions of an inner and anouter superheater-pipe.

My invention is herein exemplified as applied in connection with alocomotive-boiler4, which is of the ordinary construction and isprovided at its forward end with asmoke-box 4, which is supported uponthe usual cylinder-saddles 12. A plurality of fire-tubes 4 ordinarily ofcomparatively small diameter, extend from a fire-box at the rear end ofthe boiler, which is not shown, to the front fluesheet 4, and theproducts of combustion pass through said tubes and through other tubes,which will presently be described, to the smoke-box 4, from which theyare discharged into the atmosphere through the stack 4 Steam is suppliedfrom the boiler to the cylinders through a main steam-pipe or dry-pipe61, passing through the front flue-sheet 4 and connected in frontthereof to a transverse T- head 62, from which branch steam-pipes 63,located on opposite sides of the smoke-box, lead to the cylinders. Theexhaust-steam is discharged from the cylinders through a verticalexhaust-pipe 64, secured to the saddles 12 in line axially with thestack, and in the instance shown two petticoat or draft pipes 66 areinterposed between the exhaust-pipe and the stack.

In the practice of my invention I substitute in lieu of a number of theusual small-diameter fire-tubes 4 in the'upper and middle portion of thespace within the boiler, which would in the usual practice be occupiedby such number of said tubes, a correspondinglysmaller number of tubes67 of greater diameter, which will be descriptively termedsuperheating-tubes, said superheating-tubes ex-. tending between andbeing expanded into the front flue-sheet 4 and the rear or fire-boxtube: sheet. Within each of the superheating-tubes there. are located aninner superheater-pipe 68 and an inclosing outer superheater-pipe 69,said pipes extending longitudinally in the superheating-tubes from avertical plane a short distancesay thirty inches, or thereabout forwardof the fire-box tube-sheet to vertical planes in the smoke-box forwardof the T-head 62. heater-pipes nearer the fire-box are closed,preferably by welding, as indicated most The ends of the outersuperclearly in Figs. 6 and S, and their forward ends, as well as theadjacent ends of the inner superheater-pipes, are open. The outersuperheater-pipes 69 are made of sufficiently smaller diameter than thesuperheating-tubes 67 to permit free passage of the products ofcombustion around them through said tubes, and the innersuperheater-pipes68 are made of sufficiently smaller diameter than theouter ones to provide an annular channel between the two for the passageof steam. Thus, for

' example, assuming the superheating-tubes to be, say, three inches indiameter, the outer superheating-pipes maybe made one and threefourthsinches and the inner superheatingpipes one and one-sixteenthinches indiameter, these dimensions being of course variable in the discretion ofthe constructor.

The inner and outer superheater-pipes of each vertical row are connectedat their forward ends to a vertical casing or header 7 O, which isdivided by a vertical partition 70 into front and rear chambers orcompartments. The headers 70 are set side by side and as closelytogether as practicable in the smokebox 4" at right angles to and ashort distance in front of the superheating-tubes 67, and each header isindependently insertible and removable. The forward ends of the outersuperheater-pipes 69 are expanded into the rear walls of the headers,and the adjacent ends of the inner superheater-pipes 68 arecorrespondingly expanded into removable sleeves or sockets 70", screwedinto the partitions 7 O of the headers, the outer and inner pipes thuscommunicating, respectively, with the rear and the front chambers of theheaders. Openings closed by removable plugs 7 0 are formed in the frontwalls of the headers, these openings providing for the insertion,examination, cleaning, and repairs of the superheater-pipes. In theevent of leakage at the joints the plugs can be detached and the innerpipes expanded, or an inner pipe or pipes can be withdrawn and theadjacent outer pipe or pipes be expanded, as the case may require.

The T-head 62 is divided by a horizontal partition 62 into upper andlower chambers or compartments, the upper compartment having ports 62 inits front which register with openings at the tops of the front chambersof the headers 70, and ports 62, which register clamps 71,

In operation steam from the boiler passes through the dry pipe 61' intothe upper compartment of the T head 62 and thence into the The branchsteam-pipes of the outer pipes to permit the free delivery of steam intothe latter. The steam then passes forwardly through the outersuperheater-pipes 69, being superheated in its traverse through saidpipes by the hot products of combustion which pass through the inclosingsuperheating tubes 67 and enters the rear chambers of the headers 7 0,from which it passes into the lower compartment of the T- head 62 andthence through the branch steampipes 63 to the engine-cylinders forutilization therein.

My invention, as above set forth, embodies the substan tial practicaladvantage of enabling a comparatively large amount ofsuperheatingsurface to be presented in a boiler of the ordinary form anddimensions without involving any substantial or objectionable reductionof tube-heating surface, as the location of the superheating-pipes onewithin another permits the use of superheating firetubes of much smallerdiameter than is practicable where superheater pipes of returnbendconstruction are employed. It will also be apparent to those skilled inthe art that by the provision of a plurality of removable double-chamberheaders the employment of straight superheater-pipes is renderedconveniently practicable and that any one or more of said pipes may bereadily cleaned, inserted, or removed and tightened at the joint withthe header whenever and as by circumstances required. It is further tobe noted that, as will appear from Figs. 1 and 2, the application of theimprovement does not necessitate any change of form of the ordinarysmoke-box or necessitate an increase in its length or diameter or amodification of the draft appliances of present standard practice.

I claim as my invention and desire to secure by Letters Patent 1. Thecombination with a tubular steamboiler, of superheating-tubes, outersuperheater-pipes projecting thereinto and having their rear endsclosed, inner superheater-pipes open at both ends and located within theouter superheater-pipes, a plurality of independently insertible andremovable headers, each partitioned into two chambers, communicating,respectively, with a vertical row of the inner and the outersuperheater-pipes, a steamsupply connection opening into the innerpipechambers of the headers, and a steam-delivery connection leading outof the outer pipechambers of the headers. a

2. The combination, with a tubular steamboiler, of superheating-tubes,inner and outer superheater-pipes located one within the other in thesuperheating-tubes and projecting into a smoke-box, a plurality ofindependently insertible and removable headers, each connected to theforward ends of a vertical row of superheater-pipes and having twochambers communicating, respectively, with the inner and the outersuperheater-pipes, a steam-supply connection opening into the innerpipechambers of the headers, and a steam-delivery connection leading outof the outer pipe chambers of the headers.

8. The combination with a tubular steamboiler, of superheating-tubes,inner and outer superheater-pipes located one within the other in thesuperheating-tubes and projecting into a smoke-box, headers connected tothe forward ends of the superheater-pipes and having two chamberscommunicating, respectively, with the inner and the outersuperheater-pipes, a T-head partitioned into two chambers, one of whichis open to the main steam-supply pipe and the other to a deliverysteam-pipe, ports in said first-named chamber communicating with theinner pipe-chambers of the headers, and ports in the last-named chamberof the T- head communicating with the outer pipechambers of the headers.

41:. The combination, with a tubular steamboiler, of superheating-tubes,inner and outer superheater-pipes located one within the other in thesuperheating-tubes and projecting parallel therewith into a smoke-box,headers havsockets closing openings in the partitions of the headers, towhich sleeves or sockets the front ends of the inner superheater-pipesare connected, removable plugs closing openings in the front walls ofthe headers opposite the ends of the superheater-pipes, a steam-supplyconnection opening into the inner pipe-chambers of the headers, and asteam-delivery con- 'nection leading out of the outer pipe-chambers ofthe headers.

5. The combination with a tubular steamboiler, of superheating-tubes,outer superheating-pipes projecting thereinto and having their rear endsclosed by weldingand supported at the welds on the superheating-tubes,inner superheater-pipes open at both ends and located within the outersuperheater-pipes, headers partitioned into two chambers, communicating,respectively, with the inner and the outer superheater-pipes, asteam-supply bers of the headers, and a steam-delivery connectionleading out of the outer pipe-chambers of the headers.

FRANCIS J. COLE. [L. s.] Witnesses:

A. W. INGLE. [L. s.]

A. J. BRAMAN. [L. s.]

connection opening into the inner pipe-cham-

